Bad Momentum service

My husband and I have been with Momentum since the 90's. I changed all my policies into one in 2015 for my retirement. I am now trying since last year to get my policy to pay out. They come back every time with an excuse that it was something from SARS that prevented them from paying out. After further investigating and an email from SARS saying that there are no issues on their side. Suddenly Momentum returned and paid my money into an account that doesn't exist anymore. I provided them when I started this process with all required documentation. I also sent the bank confirmation letter twice to Momentum. I am not getting any response back from them. Nothing! This is my money that I worked extremely hard for and kept on paying through difficult times.